RF Combiner – Model D5251 – 4-Way In-Phase Connectorized Combiner covering the full 13-14 MHz band rated at 2000 W CW. RF Combiner – Model D5251 is designed for military and commercial applications and operates with less than 0.3 dB of Insertion Loss. The D5251 operates with better than 20 dB Isolation. Choose your specific connector configurations from a list of options. Additional connector configurations for our RF Combiners and RF Dividers, Non-Coherent Combiners and N-Way Combiners are available upon request.